Sudz
Sudz
- Joined
- Feb 16, 2009
- Messages
- 130
- Reaction score
- 2
I've been struggling with verification of my A/O SO2 system using standard solutions of potassium metabisulfite mixed to provide a 50 ppm test mixture.
I'm beginning to think the K-meta I'm using may be weak. Test results on wine appear reasonable but all of my attempts to use a SO2 test solution come back very weak.
Does potassium metabisulfite have a limited shelf life? Could old stock account for x3 factor lower solution strength than expected?
Thanks...
I'm beginning to think the K-meta I'm using may be weak. Test results on wine appear reasonable but all of my attempts to use a SO2 test solution come back very weak.
Does potassium metabisulfite have a limited shelf life? Could old stock account for x3 factor lower solution strength than expected?
Thanks...